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In this chapter, we looked at how to declare cursors, open those cursors, retrieve data from them, and then close them. In addition, we reviewed positioned UPDATE and DELETE statements. However, as I said earlier, cursors are used primarily in embedded SQL, which makes it difficult to fully test cursor functionality if you re limited to directly invoking SQL statements (as we are in this Try This exercise). Ideally, it would be best to embed the cursor-related SQL statements in a host language, but that is beyond the scope of this book. What complicates this issue even further is the fact that different SQL implementations support the use of cursors in an interactive environment in different ways, which can make it difficult to directly invoke cursor-related statements. Still, you should be able to execute most cursor-related statements interactively, but know that cursors are designed for use in embedded SQL and SQL client modules, so you might have to modify the statements a great deal in order to execute them. You can download the Try_This_15.txt file, which contains the SQL statements used in this exercise.

SELECT COUNT(*) FROM CUSTOMER_ACCOUNT WHERE DATE_TERMINATED IS NOT NULL;

Ideally, it would be good to walk you through each step of declaring and opening a cursor, retrieving data, and closing a cursor, but because of the nature of direct invocation, we will use fewer steps and larger blocks of statements.

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The overwhelming success of Alien Minds entertaining software title Space Syndicate surprised even their optimistic founders. No one thought that a computer game completely devoid of violence would ever sell this well. Almost instantly, Fox and Dana, the owners of Alien Minds, found themselves with more potential investors than they had ever dreamed, and the growth of the company has been explosive. In the last three months, Alien Minds has gone from a company of only 3 individuals to one with more than 30. And, there s no sign of that slowing down in coming months, as demand for more of its games is incredible. With this growth, however, came many of the sloppy practices that may have seemed inevitable. Following is some basic information about Alien Minds, Inc. Name of Company Business profile Number of employees Number of sites Major business challenge Future business plans Alien Minds, Inc. A software company that specializes in the development of cutting-edge computer games. 35 One building Organizing data protection while accommodating rapid growth. To grow to over 100 employees within the next 11 months.

1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. The first cursor that you ll declare and access is a basic read-only cursor that retrieves data

SELECT MIN(RETAIL_PRICE_VHS) AS MIN_PRICE, MAX(RETAIL_PRICE_VHS) AS MAX_PRICE FROM MOVIE;

These are the key people involved in planning data protection for Alien Minds, Inc.: w s Fox Dana CEO and cofounder of Alien Minds, Inc. President and cofounder of Alien Minds, Inc.

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you ll be creating is that you ll declare a variable named v_CD_NAME You ll need to create this variable in order to fully test the FETCH statement Keep in mind that, depending on the situation, the host language, and the product, you may or may not use this method for defining your variable Also notice that the variable name in the FETCH statement is not preceded by a colon This is because you ll be using direct invocation to execute these statements and, for most implementations, the name of the variable in the FETCH statement will have to be the same as the name you declared at the beginning of this set of statements As with any SQL statement, you will find that the exact language you use to create statements varies from one product to the next.

Jude Director of Sales and Marketing Ivan A member of the IT team responsible for systems administration Maya Lead Help Desk technician, responsible for managing internal and external technical support operations

In addition, the fact that you re invoking the statements directly, rather than embedding the statements, can lead to other variations between SQL and the implementation (such as not using a colon in the variable name) For example, if you execute these statements in SQL Server, you ll have to precede your variable names with the at (@) character Oracle deviates from the standard even more In Oracle, you declare the cursor and variable in one block of statements In addition, the CURSOR keyword precedes the name of the cursor, and you must use the IS keyword, rather than FOR You must also enclose the OPEN, FETCH, and CLOSE statements in a BEGIN..END block You will also find that not all SQL options are supported in all SQL implementations, and many products include additional features not defined in the SQL standard.

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